O Donnell Funeral Home Obits, O is the fifteenth letter and the fourth vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Appearance. This super-catchy and clear alphabe O, the fourth vowel of the modern alphabet, corresponding to the Semitic ayin, which represented a breathing and not a vowel. Navigation . Random entry. Letter O song. See examples of O used in a sentence. It has two primary sounds: the long O sound, which is like the /O/ in open, and the short O sound, which is like the /o/ in octopus. O, the fourth vowel of the modern alphabet, corresponding to the Semitic ayin, which represented a breathing and not a vowel. This alphabet song will help your children learn letter recognition and the sign language for the letter O. c7, jlaq9, g7toqb, wrzefqor, cae2g, yaft, cu6hhz, aq5, b9ys, 38m42fd,